Caspar! Been a while!
I joined the BXB Crew in anticipation of GTA Online, but I've just checked and it seems you can be in up to five different Crews - you just need to pick an active one, so you can flit from working for one Crew to another and back again if you want.
As such, I've just created an NTHW / CF Crew here:
http://socialclub.rockstargames.com/crew/nthellworld
I've sent you a Social Club friend request and a Crew invite.
Any other CF members who plan to play GTA Online:
Add me on the Social Club if you don't have me already -
http://socialclub.rockstargames.com/member/mister_tez
... and on Xbox Live -
https://live.xbox.com/en-GB/Profile?...g=Tezcatlipoca
... and then ask in here if you'd like an invite to the Crew